Re: [PATCH] sctp: allow authenticating DATA chunks that are bundled with COOKIE_ECHO

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From: mleitner@xxxxxxxxxx
Date: Thu, 11 Jun 2015 14:49:46 -0300

> From: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx>
> 
> Currently, we can ask to authenticate DATA chunks and we can send DATA
> chunks on the same packet as COOKIE_ECHO, but if you try to combine
> both, the DATA chunk will be sent unauthenticated and peer won't accept
> it, leading to a communication failure.
> 
> This happens because even though the data was queued after it was
> requested to authenticate DATA chunks, it was also queued before we
> could know that remote peer can handle authenticating, so
> sctp_auth_send_cid() returns false.
> 
> The fix is whenever we set up an active key, re-check send queue for
> chunks that now should be authenticated. As a result, such packet will
> now contain COOKIE_ECHO + AUTH + DATA chunks, in that order.
> 
> Reported-by: Liu Wei <weliu@xxxxxxxxxx>
> Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx>

Vlad/Neil, please review.
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